Cambridge IGCSE Biology
19.2Food chains and food webs
Food chains and food webs in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic44 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 19.2.1Describe, construct and interpret food chains and food webs using the terms producer, consumer (primary to quaternary), herbivore, carnivore, decomposer and trophic level.
- 19.2.2Use food chains and webs to describe the effects of overharvesting and of introducing foreign species.
- 19.2.3Draw, describe and interpret pyramids of numbers and biomass, and discuss the advantages of a pyramid of biomass.
- 19.2.4Supplement: draw and interpret pyramids of energy and explain why energy transfer between trophic levels is inefficient, why food chains are short and why eating crops is more energy-efficient than eating livestock.
Lessons
- Full access
Energy flow and ecological pyramids
20 min
- Full access
Food chains and food webs
18 min
Join to read every lesson, or see what Full access includes.
Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Food chains and food webs into a strength.
Practise with instant marking, see your mastery grow and get a study plan built around your exam date.